A first set of object controllers was installed at Annaberg-Buchholz; explained in the following YouTube

The digital signalling system in Annaberg-Buchholz operated by the Erzgebirgsbahn marks the beginning of the nation-wide implementation of a new generation of signalling systems. In this video, Klaus Müller (CTO DB Netz AG) and Lutz Mehlhorn (Head of Erzgebirgsbahn) introduce the biggest infrastructure project in the history of Deutsche Bahn. Through this, DB will achieve rail transportation that is more efficient both economically and environmentally, as well as fulfilling passengers’ demand for capacity and punctuality.